Watermom.

I am not posting on both forums, I simply did a search for calculating bleach quantities, and that came up. I will use your methods in the Best Guess Chlorine Chart. As there are "ranges" of FC on the chart for "ranges" of CYA, what normal FC range should I be in for a CYA of 90-100?

Thanks again for all of your assistance. Yours and others experience on this forum are invaluable!